Xu Yanqiao, Chen Ting, Hu Xiaobo, Jiang Wan, Wang Lianjun, Jiang Weihui, Liu Jianmin
School of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333001, China.
School of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333001, China; National Engineering Research Center for Domestic & Building Ceramics, Jingdezhen 333001, China.
J Colloid Interface Sci. 2017 Jun 15;496:479-486. doi: 10.1016/j.jcis.2017.02.049. Epub 2017 Feb 22.
CuInZnS quantum dots (CIZS QDs) were prepared via reflux method in aqueous solution using CuCl·2HO, InCl·4HO, Zn(OAc)·2HO and NaS·9HO as raw materials, l-glutathione (GSH) and sodiumcitrate (SC) as stabilizing agents, respectively. The effects of off-stoichiometry (Cu/In and Zn/Cu ratios) on the crystal structure and morphology were systematically studied by means of X-ray diffraction (XRD) and high-resolution transmission electron microscope (HRTEM), and the relative optical properties were also investigated by absorption and fluorescence spectra. The as-prepared water-dispersible CIZS QDs were around 3-4nm and possessed the tetragonal chalcopyrite crystal structure. The photoluminescence (PL) intensity of QDs was significantly increased with decreasing the Cu/In ratio. Compared with the Cu/In ratio variation, changing Zn/Cu ratio was an effective strategy to realize a more uniform irradiation and a wide range of emission wavelength tunability.
以CuCl·2H₂O、InCl·4H₂O、Zn(OAc)₂·2H₂O和Na₂S·9H₂O为原料，分别以l-谷胱甘肽（GSH）和柠檬酸钠（SC）为稳定剂，通过回流法在水溶液中制备了CuInZnS量子点（CIZS QDs）。通过X射线衍射（XRD）和高分辨率透射电子显微镜（HRTEM）系统研究了非化学计量比（Cu/In和Zn/Cu比）对晶体结构和形貌的影响，并通过吸收光谱和荧光光谱研究了相关光学性质。所制备的水分散性CIZS QDs粒径约为3-4nm，具有四方黄铜矿晶体结构。随着Cu/In比的降低，量子点的光致发光（PL）强度显著增加。与Cu/In比的变化相比，改变Zn/Cu比是实现更均匀辐照和宽范围发射波长可调谐性的有效策略。
